Not really a computer question...

Since this forum is about technology too, here's one that might get you...

About 1/2 hour ago, our RF speakers to the TV went strange and started making noises, much like if another RF device was being used around them. We switched them off, and just recently discovered that the microwave seems to be 'dead'...the power supply is in and switched on, but the microwave doesn't respond.

but it is a strange one. The microwave does emit RF, but it would need to be running to affect anything. The RF emissions decrease rapidly with distance from the source as well, so if the oven and speakers are in separate rooms it's unlikely that the two thinga are related.

Sounds probable. I am an electronics engineer and have encoutered this kind of thing in the past. It is quite likely that what you were hearing was the last gasp from a dying supply in your microwave sending spurious spikes down your mains supply and radiating RF interferance. I should unplug your microwave and check to see if the interferance has stopped.

I'm not seriously...the microwave's dead...my RF speakers are making that 'white noise' and the red lights on the phones indicating that they are working have gone off, yet most other people around me are ok, e.g. next door